From 61c39f923be2d29702f8eb3a27519a00b790cd79 Mon Sep 17 00:00:00 2001 From: Gabor Juhos Date: Sat, 21 Sep 2013 17:55:54 +0000 Subject: kernel/3.10: add more helpers to the mtdsplit code Signed-off-by: Gabor Juhos SVN-Revision: 38111 --- target/linux/generic/files/drivers/mtd/mtdsplit.c | 50 +++++++++++++++++++++++ 1 file changed, 50 insertions(+) (limited to 'target/linux/generic/files/drivers/mtd/mtdsplit.c') diff --git a/target/linux/generic/files/drivers/mtd/mtdsplit.c b/target/linux/generic/files/drivers/mtd/mtdsplit.c index 0ba35fe950..162739f472 100644 --- a/target/linux/generic/files/drivers/mtd/mtdsplit.c +++ b/target/linux/generic/files/drivers/mtd/mtdsplit.c @@ -64,3 +64,53 @@ int mtd_get_squashfs_len(struct mtd_info *master, return 0; } EXPORT_SYMBOL_GPL(mtd_get_squashfs_len); + +static ssize_t mtd_next_eb(struct mtd_info *mtd, size_t offset) +{ + return mtd_rounddown_to_eb(offset, mtd) + mtd->erasesize; +} + +int mtd_check_rootfs_magic(struct mtd_info *mtd, size_t offset) +{ + u32 magic; + size_t retlen; + int ret; + + ret = mtd_read(mtd, offset, sizeof(magic), &retlen, + (unsigned char *) &magic); + if (ret) + return ret; + + if (retlen != sizeof(magic)) + return -EIO; + + if (le32_to_cpu(magic) != SQUASHFS_MAGIC && + magic != 0x19852003) + return -EINVAL; + + return 0; +} +EXPORT_SYMBOL_GPL(mtd_check_rootfs_magic); + +int mtd_find_rootfs_from(struct mtd_info *mtd, + size_t from, + size_t limit, + size_t *ret_offset) +{ + size_t offset; + int err; + + for (offset = from; offset < limit; + offset = mtd_next_eb(mtd, offset)) { + err = mtd_check_rootfs_magic(mtd, offset); + if (err) + continue; + + *ret_offset = offset; + return 0; + } + + return -ENODEV; +} +EXPORT_SYMBOL_GPL(mtd_find_rootfs_from); + -- cgit v1.2.3